The EKHO .5 series pedometer has no moving parts! They test more accurate than spring-levered, including digi-walker which are spring-activated. The sophisticated technology is user-friendly and provides accuracy & reliability. The piezoelectric motor results in no clicking sound. Clam shell style with alligator clip and loss prevention strap. Has user changeable batteries. 5-year warranty. ONE.5 measures: • Steps THREE.5 measures: • Steps • Distance • Calories • Activity time MVPA (Moderate to Vigorous Physical Activity) measures: • Steps • Distance • Calories • Exercise time • Clock • Speed • Has 7-days memory